Measuring The Wind
Land heats up when the sun shines on it. The land then transfers some of its heat to the air above it. When air is heated, the air molecules move faster and take up more space. The same volume of air now weighs less, and the warm air rises. Cooler air then moves in and takes its place. The movement of warm and cool air produces wind.
Wind speed usually is greatest high above the ground. It also travels rapidly in open areas. You may also have observed that wind speeds are usually highest on the top of rounded hills, in open areas, at shorelines, and on mountain passes.
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